periodically the test creators will change the format of the exam if they believe that test takers or test prep companies have "mastered" a strategy on how to ace the exam. I have not heard or seen any results which would show that the LSAT is in jeopardy of being compromised or manipulated by test takers. Since the last majr change with only 4-5 years ago, the current format of the LSAT is probably safe for a while.